UCS is a reliable, pre-configured Linux server operating system featuring: Active Directory-like domain services compatible with Microsoft Active Directory; a mature and easy-to-use Web-based management system for user, rights, and infrastructure management; a scalable underlying concept suited for single server scenarios as well as to run and manage thousands of clients and servers for thousands of users within one single UCS domain; an app center providing single-click installation and integration of many business applications from 3rd parties and Univention; management capabilities to manage Linux- and UNIX-based clients; and command line, scripting interfaces, and APIs for automatization and extension. Its purpose is to provide Microsoft Server-like services on the cloud or on the premises, to run and operate corporate IT environments with Windows- and Linux-based clients, and to extend those environments with proven enterprise software.

Univention Corporate Client (UCC) is a flexible and efficiently manageable operating system for PCs, notebooks, and thin clients in companies and institutions. The software contains a Linux-based desktop environment optimized for business use. It allows desktops to be adapted to hardware and intended applications. In addition, it can be managed conveniently and efficiently via a Web-based console. In comparison to other systems, it guarantees integrated administration procedures for users, clients, desktops, and permissions and effectively does away with the use of different, uncoordinated tools. It serves as a platform for access to remote desktop solutions and virtualized desktops as well as browser or terminal server-based applications.

Comal-Linux is a Linux distribution derived from Slackware Linux. It is packaged as a live CD, and is intended for desktop users who want to use Slackware Linux without first installing it on their computers. Comal-Linux is built from "pure" Slackware Linux, making it as compatible with the original as possible, including application packages. By choosing lightweight desktop and application software, the distribution can be used on older computers. Comal-Linux is an unofficial Muslim edition of Slackware.

Alchemy OS is a MIDlet which creates an operating environment inside a mobile phone. Although it is not an operating system in the full sense, it provides a rich platform to develop, compile, and run applications directly in the phone.

GNU Mach is the microkernel upon which a GNU Hurd system is based. It provides an Inter Process Communication (IPC) mechanism which the Hurd uses to define interfaces for implementing in a distributed multi-server fashion the services a traditional operating system kernel provides. Mach is particularly well-suited for SMP and network cluster techniques. Thread support is provided at the kernel level, and the kernel itself takes advantage of that. Network transparency at the IPC level makes resources of the system available across machine boundaries.

OSv is an operating system for virtual machines in the cloud. It can run existing Linux code, including a JVM, but is much smaller and simpler than Linux, and has been designed from scratch to focus on running efficiently on virtual machines.

Controlix is a control theory based operating system. It abstracts the complete abstraction hierarchy of computer systems principles, from basic signal-on-wire all the way up to abstract libraries and interface linkage. It is written in the VHDL language and is designed to be modular, synchronous, and retargetable.

μnix is an open source DIY hardware and software project that endeavors to create a complete, usable, computer workstation using only discrete components, IC chips, and 8-bit microcontrollers. The electronic design, including the schematics and PCB layout, is open and usable by anyone. In addition, the necessary firmware for all of the ancillary microcontrollers is provided, including the advanced firmware acting as the Operating System on the main CPU units. The goal is not to try to create a competing product with any of the x86 computers out there, but instead to learn and teach the very low-level information and skills needed to create a complete workstation from scratch, starting from the circuit boards and ending with the multitasking OS. The project is open to anyone that wants to contribute or even just be involved in some way with a project of this scope and innovation.